One day after a massive rally, which attracted an estimated crowd of 10,000, Market Basket customers returned to some of the chain's grocery stores Saturday to continue to protest and show their support for Arthur T. Demoulas, the former CEO who was ousted back in June. The Boston Globe on Saturday reported that business at the chain was down 70 percent by the middle of the week. The company's Board of Directors met Friday in Boston, and is considering whether or not to take up Arthur T's offer to buy the majority of Market Basket's stocks.